Chain saw.



H. E. MARTIN.

CHAIN SAW.

APPLICATION FILED OCT-6.1914.

Patented Aug. 17, 1915.

. unrrnn snares rn'rsnr HORACE EMMERSON MARTIN, 9F ATHENS, GEGEGIA.

CHAIN SAW.

Specification of Letters Patent.

Patented it, $15

application filed October 8, 1314. Serial Kc. 8$5,32Q.

SillIlE.

side

This invention relates to chain saws adapted. for use on portable andother sawing machines for cutting green Wood and growingtrees; and itconsists in the novel construction and combination of the partshereinafter fully described and claimed.

Zn the drawings, Figure l is a side view a portions of a .chain sawconstructed acg to this invention. Fig. 2 is a similar one row of sidelinks and cutoved, the outline of the hidden ot-ting teeth of the otherenown in dotted lines. Fig. 3 is plan new of the portions of the chainsaw shown in Fig.1. Fig. 1 is a cross-section, taken on the line 13*12in Fig. 1. Fig. 5 side view of portions of a chain saw Wit i some sidelinksremoved, and showing a modification in which the cutting teeth areformed on adjacent pairs of side links, and the gage teeth are formed insections.

The chain saw is adapted to he. supported on a frame or savv ing machineof any approved construction, and it may be driven by hand or by powerin any approved Way.

in the preferred form of the saw two kinds of side links 2 and 3 areprovided, and are arranged in pairs alternately of each other. The sidelinks 2 are connecting and supporting links, and-they are not providedwith cutting teeth The side links 3 have ting teeth 5 these cuttingteeth prev? 1, y project .Lorvvardly over the front end of the links towhich they pertain. The cnt= ting teeth are made in various shapes orcurves in carrying out this invention. The

pin

1 l ill front portions 4: of the shanks of the cutting teeth are curvedand they rest against the upper rear end portions 0:1? the connectinglinks 2.

Each side link, 2 and 3, has an inclined. projection 6 atjts rear end,which overlaps an inclined projection 7 on the front end or the nextadjacent link and prevents the from bending in one direction.

Two kinds of center links 8 and? are p'rovided, and they are arranged,alternately. The center links 8 are provided with for- Wardly pro ectingdrag teeth or planer teeth 12, the side portions 1% or which are widerthan the links 8 so that they forin stops which rest on the tops of theconnecting side Links 2.

The drag teeth links 8 ere pivot front end port one oi the connectlinksQ. andto the side links 3, by P1" teeth are hook-shah Wardly andupwardly incli ed sh;v

The center links 9 ovided vv' teeth 17. The center the rear end portionsof the connecting side links 2, and to the front end portions of theside links 3, by pins 18. The gage teeth 17 I over each end of theirardlv and rear e front end porare curved and nd their shanks. oi thegage -i the front g teeth 5, at

the drag or The front and and poini the hottcrn of their cut bottoms areindicated by no dotted lines 11 in Fig. 2. The rear ends oi the gageteeth have beveled portions 13 which underlap beveled front ends of Therear ends of the ranged a little below the level of the cut ing edges ofthe t h, prevent the g teeth from taking too great or rank a hold on thekerf in the saw out. front end portions of the gage teeth limit thedepth of the out of the slicing. or cut- ,eeth 5.

By making the gage teeth I? with beveled ends and arranging theni as setforth, each gage toot-h forms an efficient and positive gage for twocutting teeth 5 and for the drag tooth 12 next following them.

The front end portions of the cutting teeth 5 have curved portions whichrest upon the curved lower'portions and shanks of the drag or planerteeth 12, so that the drag teeth are reinforced and supported by thefront end portions of both the gageteeth ower portions of The , -e dragteeth 12. teeth are oranism of the sawlng machine.- The variousoverlapping portions of the links and the and the cutting teeth. Thecurved portions 20 are preferably formed separate from the v curvedportions 4, so that they intersect where they meet, in order that thecutting teeth and the gage teeth may be stronger and lighter and betterproportioned, but the curves of these curved portions may be madecontinuous, as shown in Fig. 5, if desired. I

All the center links have downwardly projecting lugs 22, or otherapproved means, for engaging with the driving mechbending in onedirection, when the. saw is straight; and permit it to bend, or turn onshanks of their teeth prevent the saw from its link pivots, in theopposite direction. They also stiffen the saw, and prevent it fromvibrating, so that it can be used to out green wood or lumber toadvantage.

In the vmodification shown in Fig. 5, the

general structure is the same as hereinbefore described, but instead ofthe single pairs of cutting teeth 5, the saw is provided with two pairsof cutting teeth 55 arranged ad-' jacent to each other and pivotallyconnected together. Instead of the gage teeth 17, similar gage teethformed in two sections 27 and 37 are provided. These two sections arepi'votally'connected to ether, and these two sections are provided orthe accomm0- dation of the,two pairs of cutting teeth 55. The curvedfront end portions 19 are formed on the front sections 27, and thebeveled end portions 13 are formed on. the rear sections 37. 'In thisform creased slicing action is provided in propor- .to the said links,

of saw, in-

tion to the planing action of the drag teeth,

but otherwise the action is the same as that of the saw shown in Figs. 1to 4.

What I claim is:

1. In a chain saw, the combination, with side links provided withforwardly projecting cutting teeth, of center links pivoted to the sidelinks and provided with forwardly projecting drag teeth having beveledcutting portions, and having also gage teeth each provided with anupwardly and rearwa rdly inclined top which extends from the lower partsof the cutting portions of two cutting teeth to'a point a little belowand in front of the sharp cutting edge of the next following dragtooth,said gage teeth having beveled end portions which underlap the beveledcutting portions of the drag teeth.

2. In a chainsaw, the combination, with side links certain of whichareprovidedwith cutting teeth, of center links pivoted certain ofthecenter links being provided with drag teeth and other I center linksbeing providedwith gage teeth each formed of two pivotally-connectedsecwardly and rearwardly inclined tops which extend rearwardly frombetween the cut.-

ting teeth to a point adjacent to the cutting HORACE EMMERSON MARTIN.Witnesses: v I

H. G. STORY, .C. B. CHANDLER.

. tions, said sections having continuous up- 5 Y

